Synlett 2006(14): 2261-2265  
DOI: 10.1055/s-2006-949640
LETTER
© Georg Thieme Verlag Stuttgart · New York

A Novel Silver Iodide Catalyzed Sonogashira Coupling Reaction

Pinhua Lia, Lei Wang*a,b
a Department of Chemistry, Huaibei Coal Teachers College, Huaibei, Anhui 235000, P. R. of China
b State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P. R. of China
Fax: +86(561)3090518; e-Mail: leiwang@hbcnc.edu.cn;
Further Information

Publication History

Received 10 February 2006
Publication Date:
24 August 2006 (online)

Abstract

A novel and efficient Ag-catalyzed Sonogashira coupling reaction has been developed. Terminal alkynes couple with aryl iodides and aryl bromides in the presence of silver iodide, tri­phenylphosphine and potassium carbonate to afford the corresponding cross-coupling products in high yields.

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The unique Sonogashira coupling products were characterized by mp, 1H NMR and 13C NMR, and MS.
(4-Acetylphenyl)phenylacetylene: mp 95-96 °C (Lit.24 94-96 °C). 1H NMR (250 MHz, CDCl3): δ = 7.91 (d, J = 8.41 Hz, 2 H), 7.58 (d, J = 8.41 Hz, 2 H), 7.52-7.54 (m, 2 H), 7.33-7.36 (m, 3 H), 2.57 (s, 3 H). 13C NMR (62.5 MHz, CDCl3): δ = 197.1, 136.1, 131.7, 131.6, 128.7, 128.4, 128.2, 128.1, 122.6, 92.6, 88.6, 26.5. MS (relative intensity, %): m/z = 220 (60) [M+], 205 (100), 176 (48), 151 (18), 102 (10), 88 (19).
(4-Cyanophenyl)phenylacetylene: mp 109-110 °C (Lit.25 108.5-109.5 °C). 1H NMR (300 MHz, CDCl3): δ = 7.59-7.66 (m, 4 H), 7.53-7.57 (m, 2 H), 7.36-7.40 (m, 3 H). 13C NMR (75 MHz, CDCl3): δ = 132.0 (2 × C), 131.8, 129.1, 128.5, 128.2, 122.2, 118.5, 111.4, 93.7, 87.7. MS: (relative intensity, %): m/z = 203 (100) [M+], 176 (8), 151 (5), 75 (5).
(3-Cyanophenyl)phenylacetylene: mp 69-71 °C (Lit.25 70-71 °C). 1H NMR (300 MHz, CDCl3): δ = 7.79 (t, J = 1.50 Hz, 1 H), 7.73 (dt, J = 1.50, 7.80 Hz, 1 H), 7.59 (dt, J = 1.50, 7.80 Hz, 1 H), 7.52-7.55 (m, 2 H), 7.45 (t, J = 7.80 Hz, 1 H), 7.35-7.39 (m, 3 H). 13C NMR (75 MHz, CDCl3): δ = 135.6, 134.8, 131.7, 131.3, 129.2, 128.9, 128.4, 124.8, 122.2, 118.0, 112.8, 91.7, 86.8. MS (relative intensity, %): m/z = 203 (100) [M+], 176 (7), 151 (5), 75 (5).